Sir Alfred Henry Lionel Leach, PC (3 February 1883 – 26 January 1960) was a British barrister and judge who served as a judge of the Rangoon High Court from 1933 to 1937, Chief Justice of the Madras High Court from 1937 to 1947 and a member of the Judicial Committee of the Privy Council from 1949 to 1960.

[1] In 1933, Leach was appointed puisne judge of the Rangoon High Court in succession of Mr Justice Otter.

Returning to England the same year, he was appointed an Official Referee of the Supreme Court in 1948, serving until 1956.

[1][2] In 1949, Leach was one of five former judges in India and Burma to be appointed King's Counsel in a special list, "so that advantage may be taken of their judicial experience for the purpose of obtaining their help at Assizes when required".

Lionel Leach died in his chambers at Gray's Inn Square on 26 January 1960 at the age of 76.